City crews will be putting in plenty of overtime over the next few weeks to finish concrete repairs after the company contracted for the job went out of business.

The city got word last week from Asty Construction that the company had gone out of business and wouldn't be able to complete the repairs it had been contracted to do. Now, city crews are facing a tight deadline as winter approaches.

"Concrete needs to be obviously above freezing to set properly," said Sean Somers with Calgary's department of transportation. "So generally, we're not pouring concrete if it's any colder than 5 C."

If the temperature drops and concrete can't be laid, the city says it will have to do temporary asphalt repairs.

There are roughly 250 holes in the ground that Asty Construction left unfilled.

Most of those are residential sidewalk repairs in southeast Calgary.